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EnglandPhysics

Fields and their consequences

4 dot points across 4 inquiry questions. Click any dot point for a focused answer with worked past exam questions where available.

How do capacitors store charge and energy?

Capacitance as charge per unit potential difference, the energy stored on a capacitor, and the exponential charge and discharge of a capacitor through a resistor with the time constant.
A focused answer to the Edexcel 9PH0 capacitance content, covering capacitance as charge per unit voltage, the energy stored, and the exponential charging and discharging of a capacitor through a resistor with the time constant.
11 min answer →

How do charges exert forces and store energy in a field?

Coulomb's law, electric field strength for radial and uniform fields, electric potential, and the motion of charged particles in a uniform field.
A focused answer to the Edexcel 9PH0 electric fields content, covering Coulomb's law, electric field strength in radial and uniform fields, electric potential, and the motion of charged particles in a uniform field.
11 min answer →

How does gravity act as a field around a mass?

Newton's law of gravitation, gravitational field strength for radial and uniform fields, gravitational potential, and orbital motion of satellites and planets.
A focused answer to the Edexcel 9PH0 gravitational fields content, covering Newton's law of gravitation, gravitational field strength in radial and uniform fields, gravitational potential, and the orbital motion of satellites and planets.
11 min answer →

How do magnetic fields exert forces and generate EMFs?

Magnetic flux density and the force on a current-carrying conductor, the force on a moving charge, magnetic flux and flux linkage, and Faraday's and Lenz's laws of electromagnetic induction.
A focused answer to the Edexcel 9PH0 magnetic fields content, covering magnetic flux density and the motor effect, the force on a moving charge, magnetic flux and flux linkage, and Faraday's and Lenz's laws of induction.
12 min answer →